{"product_id":"sehprobentafel-mit-optotyp-buchstaben","title":"Eye chart with optotype letters","description":"\u003cdiv class=\"productDescription\"\u003eThe C-Test is used to determine visual acuity and to test for crowding phenomenon (crowding effect; based on the C-Test for distance according to Haase\/Hohmann) at distance.\u003cbr\u003e\u003cbr\u003eHaase and Hohmann developed the first C-Test in 1982. The Landolt ring (standard optotype) is offered as an optotype in four different straight directions\/orientations (openings: right, left, top, bottom).\u003cbr\u003e\u003cbr\u003eIf crowding difficulties are present, visual acuity decreases the closer the spacing between the optotypes. An irritating interaction of adjacent symbols occurs. Crowding difficulties have long been known in amblyopic subjects.\u003cbr\u003e\u003cbr\u003eThe result of the visual acuity test depends on the symbol size and symbol spacing.\u003cbr\u003e\u003cbr\u003eBy comparing the measurements of visual acuity with single optotypes and with row optotypes (printed as close together as real reading texts), the crowding ability when reading closely spaced optotypes is investigated.\u003cbr\u003e\u003cbr\u003eThe C-Test for distance to test for crowding difficulties is suitable for quantitatively detecting amblyopia, even of a milder degree.\u003cbr\u003e\u003cbr\u003eScope of delivery:\u003cbr\u003eC-Test for distance to test for crowding difficulties, 2 vision test charts (made of Alu-Dibond) printed on both sides for a test distance of 5 m.\u003cbr\u003eGerman and English labeling, visual acuity values decimal, LogMAR, real and equivalent values in meters and feet. Optotype Landolt ring;\u003cbr\u003e\u003cbr\u003e1. Vision test chart:\u003cbr\u003eFront side: Cover or protective side\u003cbr\u003eBack side: Landolt rings (single optotypes)\u003cbr\u003e\u003cbr\u003e2. Vision test chart:\u003cbr\u003eFront side: Landolt rings (row optotypes, 17.6 arc minutes)\u003cbr\u003eBack side: Landolt rings (row optotypes, 2.6 arc minutes)\u003cbr\u003e\u003cbr\u003e3. Answer cards as table display:\u003cbr\u003eCellophaned on both sides with matte acetate film.\u003cbr\u003eDimensions: approx. 155 x 220 x 85 mm (H x W x D)\u003cbr\u003e\u003cbr\u003e4. Instructions for use\u003c\/div\u003e\u003cbr\u003e","brand":"OCULUS Optikgeräte GmbH","offers":[{"title":"Default Title","offer_id":56934006260044,"sku":"114002800","price":48.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0828\/1056\/9036\/files\/BC_Upload_f45451f4-f3f2-407e-ac56-c1988d1e6b66.jpg?v=1773256467","url":"https:\/\/aurosan-shop.de\/en\/products\/sehprobentafel-mit-optotyp-buchstaben","provider":"aurosan-shop.de","version":"1.0","type":"link"}